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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5642ac2ba68b45a1e24c122d49bc7d6a02e69603047357f9053c1bc7b9ff0bdc' 
  AND token = 'R1ALr6GzWwV2MQEDNdVGPJ6BbERijZo9sszQLpb5CUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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