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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d751a97d1ec3e866b0731ed1d23abd1d330ef8346ab87f6fa6d776ed1faa1e1' 
  AND token = 'JZoz5713AnkmMSSnKxZUlimFXumd9FaX6AAG173beak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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