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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '408618aaf89d411cbf36947adc7f1dde3b79d7ceb1839702bd1808ac12d3973f' 
  AND token = '2gd4OtBxJ9haWrk0mPpfSabOjPOnnxmHUDrN1lO/Aao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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