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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff479eab61ed8667f9f6deee44b591eec3117628ddc3f99fe1266f1a67a34a37' 
  AND token = 'Ww4z+qc+3Vr+w0koDw3g25V2HhljuvSYS5G5YVTalbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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