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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cba663b6fa574d871669edb20a071b3f5cb135add63ffb7267f1b6451f21e47' 
  AND token = '5YrL/umJ7NAbDMX1myD+y+xZ58HYiv1nIYvzQtduq+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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