SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2efc5300aadb9ce128705963e3b801a995a1b0eebf7bf55ae6fc87975bd05960' 
  AND token = 'jWXaxp8KIzY7O0rbdiOuadpXTLf4b0BFAogGdNbQ01A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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