SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e6402114e786dba6d2498fb6905d6177200ad7313cd9cbd0d4268fcf3f97c5' 
  AND token = 'lLp0gq+NRJOt/ss09bFLKfpLxAqoBNSCiKIOEftAMQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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