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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56763b4ae4e8cbb0bc339aa0d5f1895655a693286174a1ff233aa9edc525aca1' 
  AND token = '06yOt13gg+UBXHaVKJeaFp7sKv+lPuJ6rL/4Jr2+reA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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