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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a6250df5af5ff2229f9abf1e5f939d3827fc3b40e985acf993dcb34af8690b' 
  AND token = 'sh2XsjsaVgx0h5mQdmel39YzX6J7xKCfyllxDM9hBbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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