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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a492270a7a22a14e5041c881f6d0a3a0fb7df2a3e9e803944cbc33b9d8a36158' 
  AND token = 'uznEWO9lT3Ptjf5qoC8W4MrO39hxCBgwebEiK6/2KlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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