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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca8c14e5fe977ef1c91d078f463c8bef130f9517ccd544ddd80a4e31b481e40d' 
  AND token = '4E5wWsQhnN2VuFqiI6H+UggZlvyHIPPxEGqHeVytjZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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