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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eae033929bcf98e8d1d19a1909bb6f3ccb66af4568eb22008b5615e062d092d' 
  AND token = 'tc8c8/t5RmXtdGiQpwhWGI+EHqXrSi4IYmFL3YJbaqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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