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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72b372527dea1aac0d58f74e6f6510a9e0684ff14732b7119e3619a4541b3ec9' 
  AND token = 'veQVQr8XdbIjfNk1h23/SxqREh2neMfao3VTPnqEbgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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