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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca425cc11dbb4f21dc550e42e4cf3115226cf5e4b4bb57f4a3ab0f9d1d8035e1' 
  AND token = 'XpaOwon28IY046N5eEsKrUTH4tyF5DTYdBDSx/veiJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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