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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2de194a2bb6831e00e9b7b288e97572d0640ee99d14986b4267768d5400d7cfa' 
  AND token = 'pEQhzpVVVONzMpzjW71HFr04TGff0JjqMEGOltOrZU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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