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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '530eae3653a8f2cc06236e6436c7140d9ec55f0ca850a0db80a9cb5a8659a25f' 
  AND token = 'bRnjiKUz6aZyrPKGMP1VA2n14ipg8JMVZdVuQkoNjfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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