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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba7731b31eec5376305f42b0c592db7b9adb0be88921889b41dc7448f2f035f1' 
  AND token = 'a4/791cGP6EjKn/Ew8rzRh1xhr1/I7OTUPVkm5ssfQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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