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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73128f490c07279f8c757dd9edcc0a4e7b8a2a1619b78a5f878b28da917bc472' 
  AND token = 'X0LyKE/DOtROg6O8yihDQejBXdkbroPHkJh+tEcRTxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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