SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b18fd2be7cfa22281b0d91f02c939a8df1eac4a3b345007d9bee3e7b3ea56e5' 
  AND token = 'Vj6gI7D44Q4hvduPQInwlfPfAKB/Dom4UCw/ypmRPLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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