SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec4dcf06027d2d6d66bbeb251be4227bef03664af16904c0dcd1ae3853a7f19b' 
  AND token = 'r5B5Molo2sH+y75rWVzQGM7YM+pgxWBNKDv/6YYCC7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00554

JSON explain

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