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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc7450df7ed1764ac6bbf58a8a3391b3d6965d22a35cf71cac429c4f1c24e4e' 
  AND token = '1OpbEYRghCiZKDB3nyPhoiUok01VttNdr5SfQMik0H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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