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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '491df78d1145fcd7ff182c1c85c40ae0dee1fd6e10d21f9283261e8c5ad1855a' 
  AND token = 'UbvdRF0RncQKUuKD7OGND0YJ4uzC8AljsVyubLeqeRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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