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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7676f16caeae102137997abd52894c5d67b8a28613a6ee59d2c2cd1f8a5f87ed' 
  AND token = 'MKUDV8F5hI20ASK+5utyxOFc9tvfukkzx8Zk2AHZr/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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