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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a23c809cc2997668c7d4ffe9d6ccc17a4fea0187badc8bb1f946ecd71b629c45' 
  AND token = 'xH+ivzBeovb0U3qbHtg3WVpgrcR94EkmetKrpJxEexU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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