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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3842d699b931f4077d01f4105386340f7b896da88bd582152e383aaa00ebf12b' 
  AND token = 'wBtBg2cZssgmsrlMGiscQJHQK9HZfqZdPEzA6Hy143I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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