SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dca8aa022f9b8179f0000ab6b7ba3a7dc2bfdc045345949ee2cc798d6e23594' 
  AND token = 'CJkjkNW7wSpVh8XZkIQLb6gJnH+a+m4jroBK7qaa+Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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