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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ce29567c36d8afdb4efdcc6a571311a7cb28cd2d45b70ecd54f5a6bb8aac7f7' 
  AND token = 'kRu6sY9VYyRa4nBdrfBS/d/e5bqWJcrFSQ4lu8wGhhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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