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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3017475e9599137d11d26c0b8149e80692188fb2f1521c9b5a6b5b988e55a477' 
  AND token = 'nHfU5I0abQypCvOqetGA3gPzEtGO7slGNL+6Ln4ltbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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