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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35569bf6518b61222f46f7daefed03710367fffc78f63a85032852ecba41132b' 
  AND token = 'bJQ7duUKAlaYobxlW9lrR6nSmR1NANr1KsW5j1VBu/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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