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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bad6c6fae966037bcdd01259405664144c57747cd413b35269e12aa58d99ab7' 
  AND token = '54ffojWlbq6Ex91kugzk7all1FPpFCp/7FZ8N3wv7tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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