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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3063b25a788299f83caa55fd98dabe55a8e6af9cbb8ae85da9447b5bb04bae20' 
  AND token = '1jcpPUpqpfOlv4Ft9AxsOo+ppxDrTq0s3TbYIU3phjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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