SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b5e495fe23a49c8fb4f5b5092f2a0e690ed406452a16701b93111aed17e5428' 
  AND token = 'pQzGaQ6076PmmNqBA4oBUPyckD5CjUK/VJBD+G9ivFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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