SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '385559583ddd19b3cf0c434a7fc70bf5081c61938896d6af99e4507abd41b6af' 
  AND token = 'fXpAW8abhTBskGYrKNE1YzZvv6uz8ZRCkIE7Pq1ghHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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