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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ae5605bcfa8f58e9e6ef1e2b91f7c7ad4ce01ea447556cf3c108cc2004608d' 
  AND token = 'IgGFDElCK1qL9eDKjlyVFByzja9MCyWRjDhteOPCUt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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