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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7652d03effb77942cd160e6d4ca730500aae65c850bbd613b5e1c0018b04ca4' 
  AND token = 'fNi5tCulCFkPd8Eth6RxH4qILJBpsEN6dVuz3/NswEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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