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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ef920d881ac278c22deac1e5b35d5e5bf454078568853fe29afa594638cc550' 
  AND token = 'YpYFRVaXfKLMQc2kxUfMlrQnOr4D37oaaGWs5lMQ2mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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