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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46b4d895f669a5e7f10ccd4742d0cb7abc34ecdc7237d338dc1b1fc3eb411fe6' 
  AND token = 'ciYAEBJ8u1jTVBOiu0lOjxOy6fzyV4TGI23qCkN0HJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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