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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14608e9ad9d9949b2387cc16c11cc63c5b5c4abd0c19a04ebaf888bf41f80a8e' 
  AND token = '/3anwNx0H/QjnswPn7RqIdj0SLgowzZuE3fRmQ2rnPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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