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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5599fc8c863c405544fd3fba124e1c2a0f5b2c77f96d89ed80c828dd1b6a12a3' 
  AND token = 'l9DVC6STLJ8qTBi4Y85Vd8snzfXAEKEX8EZ1EuJUq0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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