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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f77edbd08749bd4f1515b0684a4f360505cc5f66be2d7477fdaceef035417368' 
  AND token = '6Ok6CwLrpOr13Iai3XLAcO6wapMHr1HjNVDb1ge0OYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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