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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9af00a982d425ce6ca198dfa878bbc21a13f7a1887b0d42865796b51cd27098a' 
  AND token = 'DWOI89PbvjB+UPB/OjPl9m7jMnAr5pQqC6vg9BAPCI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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