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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8f11f7985c1d792175a409c39f68019d6482f63a168295008c8c7f9c351e25' 
  AND token = 'kUR2toXPuw7OJU5tJq80hEcFznZ1LwiOIJ/ULWeQkWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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