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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68f2657cf77cd93a824e8c59c92f441d2315b6b050a07757f5d9aafc4fbcdee5' 
  AND token = 'pQbvforq9UOacn6kpxBK1ugbk4iGE0GHyrMiV+GQhU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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