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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c6cb9ba9ab247269e5827408f476b191fa799942010e8e24c328ec9613d6046' 
  AND token = '9DdsbqESWCwglCRBXBvBd1jpN+O/f/7MESyVz5ecneU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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