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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c687a6d1fc77ffa13d8a7b7b776036510b554a5d976656784726ced4bfda2cc' 
  AND token = 'eZPmfU9HTOjBOS23d+ucAbWnOeHr7xj6QIQKiVmZ/LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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