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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da1ff69844f6fa884aab65c4c6fa8cbf3636947e1984981ba008be0da9ffa4e3' 
  AND token = 'ZBXCXT0XoURD4E/cg1ELVTZqMSxmOvYOyBcURIJSGqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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