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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ed0eb27607580ef1ed85ca42537a5602adf55adab78e42d94558bbd68f20db' 
  AND token = '+OmjFVmBz00jZXZiiSGZDu6xtoa/7W88sWs1bXT0RNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00241

JSON explain

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