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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd24822cae9b663f1d35298594bb02b4cffca866c5306da6ce9a677155ae83484' 
  AND token = 'MqM7hXRgdvxGqSCw7T96ItRueuMLf5JbX7c9HCxeieM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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