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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6113e22f46f6aaee589b55c2cc3085339f73a5789ea571858fcbd28117e523c0' 
  AND token = 'twz8e8yj/4+F/Z7ow/0zX/oRti3mPPrGRtjpts4CNdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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