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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2314c3e8bae7b39d67861eb1114e1e7bb9593b5bf84eb0e67308e4c84709116' 
  AND token = 's6AYsHqQJ1vut1YTflIKM5mGSKavpLVZOwIZIdZc+ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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