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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40b280acfcae3d73c91247a2fb7cf24cf00ba5fa71a193ad4d019f6d3afbe906' 
  AND token = 'PQ7jbCNlU5GFPoHuQ6TW7axi68YJmij8C+WuZellSRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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