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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6179fca924aa940bf0d8caae45f2a5b93b5dad9c7feed1342532e89f43d63d11' 
  AND token = 'd34BGUzWPesvrT8ylBaq5qgNw0YoSUd+VWi7KDvF43c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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