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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3428da6fba3ede5f4a8b14432b45f5f90be64255f24a4d8b795d53e0d2fcce72' 
  AND token = 'zrL7/3w86ukbuUsfpUerrfhO740rLRRVt95fNcEHcXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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