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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b0447bed9ad6983dc5707a7b28b3c681e03a83661a981d41aea570b4b155819' 
  AND token = 'OCU5nkZxpHm9UonrPGH6FbBafBQpTxy6rjhq4d7xlY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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