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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a92f53b44eaa081f6488bff5d7118dce7faf3eee01a4c03bfb685c84c2445870' 
  AND token = '69PrwhaX3huwgZAUMbpeBhe/+8olco28Uix9KSrL2zM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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