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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a71d59e99f3aa45b9ab1343e19bf4c9d7a65728284388cae59cce08ce16a22' 
  AND token = 'KyD5uskmm2HWkITy7ccQoOpQluJsWZvtCRP2eRME5M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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