SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e241bb225564f81ded57a9f0c28f9c775ebb94a961c87b340d6a9c61235794' 
  AND token = 'D/eqsXg/G/X8nu0NhJi02cgKjC9fjVnEamYNFC6mkoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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