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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9411254136f27dfeefc686fc328103c2a2f464a951eb7b7945b8263ad0458606' 
  AND token = '96nqZjvEtJpSA5T+2pHc8rf4yx6IxkEQE6Vn8MVEa8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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