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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '630cfbc7b05dd338462078e42e4d6e1fd6f1eecaa0d5a38ae8901e64cf33e708' 
  AND token = 'gVABiH/q69zD2SbGAYT3rbd4ZvlzzB2jiWkrV19NZuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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