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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c6de4a17c3e0832bf46582d456ad7c677a1f020b7670b8efba8e41cfee5186' 
  AND token = 'H43EEYH8S19xdQz+WlGMt9KfMRKTFgqJgQQgtcjCEoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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