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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4019b6166aab9e66fb9ca72cc3fc07eaddf0c340cccc135d859fd89ac80ac00' 
  AND token = '8Zi4FixQGHr61nvRfzroG96uuXctUf68q/83R9f4rY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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