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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e878406e0f0ef568e0e9872adf7969afce328e60a0d2796e5a6af0982684e22' 
  AND token = '9oKPC4mMjge0/66ZxDpWRvSE3VHYthyETMuCu6hJP/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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