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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d1e1831330262c077afef55b7d90db714b604db46db9476d726d59519e99efe' 
  AND token = 'ckEPfn2xhn4TObyyBp4xqQlwB5unC+hQJ9Q5eMKM6us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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