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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b9ff67423b89490da2fedd2e1375cad083335177524572b6ed8aa3ae306326' 
  AND token = 'rPwIe85agUd1z2JyPmsSSecS+WXQcUZy92/NRZEhPK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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