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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '754b0fc96810a58ef1b3d3c4241204c9732adede2f3eb6245f6a99de9d38ba82' 
  AND token = 'sid+vnZciTYih4pZTrB7ftutkgV31tHLW6oAR9+A/Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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