Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '165539f65d11170cc9e147ad31c85deaa768298f4171a96e6b129659c1ce57da' 
  AND token = '+FruSaGmIcKkJmyssbiEDcaEdFmuvixp6qJGm2ndscQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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