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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88b7078ee2d6de44836ac097ae5c4333bd439c53dd5d766c4b0ca98c3ab900c9' 
  AND token = '5E0iGa9NNzoIH4ckrdIAhFvrnxvLzrkRN9lIicLApIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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