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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d67f5ff8a401ff3db6c9924ce9ab09ec1a6538ab903cfbe8e8712ee15ceefab' 
  AND token = 'mdxtSNKGkU6OXrEEtq9eiQOakeh9t3LXhNFIXRk+V8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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