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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37411db1b56ff551b721dbdb339e869bd77bf5d7e570383ebf747607d9f553c1' 
  AND token = 'BHa+p5iUmW7nXruAOXBmxoX5ZFGdMrXd8OgUXbpJYag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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