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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c9b17f47077ddcc288c12293c861fd544a81eb5e6f7b5ec47737c2b9deb1316' 
  AND token = '5ozG9m6V2AZVtA3q72KB2l2bx99oxMM8VzwZzvQ0u5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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