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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4df07db7578302e0378ef474f5695c93881c2ab9bd995e90667d6fd2520396e2' 
  AND token = 'aol0hcNvwWctU0Con9YYUttdiNgNLW93oX8Y6JoR14A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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