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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '702fc421f5483c977cb81906eceef0d6b199f8188d105788904b44e016f557ab' 
  AND token = 'oKlzhXavLas8UU/jnc3iE1EafcPu7OomfeEP9sjIiT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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