SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09087cc6ab872a42b735cbb05a701ef87b12fabe18e962c33d72911a1b98d3ae' 
  AND token = 'fs8w3mh9q6EofTMJUZzMv1HrqlJ+U+o+J0tjIJYwp/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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