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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23385118d8a659527ca304782fb1ab8be3d3d5a32e7295676ae768661943d576' 
  AND token = '7Dy3sR6cfh+WtBWWReqiaxXtAGl2oQdsGUU6QjFxzBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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