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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '763dea3eaefd01b8b7e96ea8a6459242ed15d56aa54832cd434369241bd62456' 
  AND token = 'WdQv9sFd4VkQdRQFBrnAW+oXKUMKAUh0NGzRR9bVnzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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