SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b460dba572d64032a775084451fba4d0f97498f617c8045a85d3440a2a11dbec' 
  AND token = '9ATJCYv5YugQ2fLhG64ZXGjRjgk7gEWoM0M+FurNIDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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