SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e735a9292e8bf4aa0bc75fd732c8404ff3812530074eec24dd0611965d23ed36' 
  AND token = 'E2wgPdpm+zqZWhg+npUXuebYYBIbUZT/IE/zxFJM3gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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