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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24bd2145d44243ef22044c9a4bdd67f44d1d144c9744f031749efea4f0317871' 
  AND token = 'dckDg6AJr3/SxmTNoB+PxeICKgQ5/H1vvpWdrovEN1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}