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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c33db5515a9b76d4febe53daaf75dbde30e0828ff5a57d20ab5e4bdf4c8e9ffa' 
  AND token = 'G+gRe/mNr1hqWI87ilNLDJTx9Wp+LyQOEKF+NT5Tyjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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