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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb4257132fa9c017d90354922b76ecfa47462c646dd11d572c2acb37199c091b' 
  AND token = 'hr0RG6uvipuhByj7ggTkR+uqGdbP9T0QxnvwJ9BKddk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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