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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23bd29a8b0028c73cdfe2454252fbb354f1ca5ec77a8e9a1dbfee08fdbaf94f6' 
  AND token = 'OYNBRf+VedPb6yljRT/79B4ytW0LNMt0XsCk03JEzNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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