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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b174985d4260b81c4070701c540a7bbaa720bd04b23a65cc1d9b2bbb7ddc258a' 
  AND token = '8xEg5/wq7XEnbfD4hisQk0PCGLPOBM8+BqEz8pHpeIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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