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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dfe060835253f4da0f06c25a224ba5c9073ddbb942ad55f1f2e10d4d72219ab' 
  AND token = 'A22jUMPNhuA7YZCAuZeEgHi9Ud0xNxc607d1hAcPdSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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