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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '866449fc1bdb4a26414f953e92500ec8fb1eccc0190a2d3a4f36c11043e23074' 
  AND token = 'MTi1TabAqeimNN9j6M7wwzeukOuOzeAUX7Wguy5uK4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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