SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60bb3c0b6fa9e9e5c64ba4db561180764c91ccb9f307d27c73e680de1c0471f9' 
  AND token = 'PXv2VBwpGnj9j/mDE6NBwiFc4WiUPmmGepz/X+SlPyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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