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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e7228952af154c21c7700f70b180569a40eadc0ada37b8579c82333fe7b9952' 
  AND token = '9cfk9ozBhkTeuSZ1GOVO95sHDKsAg7B8gfEPs/0j62U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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