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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3fc87c09043169d09bfeb4628f2720e91804acef5e2979cdc0323bd120cdb3c' 
  AND token = 'xKriI6FOwThl4r/6Jt6bkWhtKHP6BmKFeK7jn/W02Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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