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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa36f074a2812013556aac5841ca2a3dcb1c6bb9da55ae71a40fc6d533415cd' 
  AND token = '+7yxJzqC/LiJbrwwNoB9CcglJO4ZQxlBCvU/CaHcj6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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