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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5436970e28e53c0903794f3b570d47a41659ceb81c78aa8bc11b7bf51c9a28d2' 
  AND token = 'wINACewLqVkF97F0v3fMq7r5cV7LbIL89Jud+9vXKj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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