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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca7791303bdeaded77f8ea6ee721c1f6ee89cdb1b4981d27a4f26b47f96baab8' 
  AND token = 'WszAxpOTbKWym4b5rsg5JgebvM+j5FWjE8lOXiqe1O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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