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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b18235a4ba5f1ed4519320d44d54358e15c90e5dbe7d056cf4530b804473ebb0' 
  AND token = 'IBb/yM4eJUq37GLapgiUpctGkL6lgMYO+nq9hVYBx2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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