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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efd86ca06202f7b5e3038700650ab05a14fdfe074ddff4e6fc61c4a69ba7d461' 
  AND token = 'gEKIq3EUGe2HUSAQIWqI3mu/Le4YbvE1lUmX55qKgZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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