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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '489145236b5fbd1d7ea0ed18f4729634d3ec6ef8f4bd9923cae7f20a34451b41' 
  AND token = 'le9Scf0W1NL0qBZAgiZY7Q4VuLKHauO9Nczjx4005S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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