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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0154d5388aecd358cedd09974aeeff523d08d06d53e05b64a6e0c7fe8e415cd' 
  AND token = '8Rh5o41mIBStZpP2D3FdO7u9L1q0RoQHqjxrV+UyL2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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