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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d704e8e95f673ee9a8f200c64042d00132c731e4e1e73d4f68e5130e658d42b' 
  AND token = '3S7s+YkNR9oScGp5P/lzHpBs6HpmJsF56kkNk9l3rhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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