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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa7c166420c20285756a6f08df960f2ccfe5be7faedbaf24e6ecddb1bcb9f6c' 
  AND token = '/LqKz7IbbO2ipBl8odB/klxqtcBZCXT5/MfZAzO6l90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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