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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3416aaa10399093a48201579e729ba480a2268cd904776cd2ed4fe9fd72c49df' 
  AND token = 'BLDcTDfw5dOjidvSVUi2yiOoTj9W5S4CC1zMi2ji6EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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