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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '912c0d9cba4776a8ba4369af8e69ad6453caeef62a183b8f57d8684d2a80a6b3' 
  AND token = '5i5fxZZFlioLvbU9lAF85jklsfNKhx5MWUOv7rGPIIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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